And now, we turn to the ancient hatred in the middle east, taking the lives of modern teenagers. Tensions escalating as Palestinian militia fired almost 100 rockets today, after Israel followed with... See More
And now, we turn to the ancient hatred in the middle east, taking the lives of modern teenagers. Tensions escalating as Palestinian militia fired almost 100 rockets today, after Israel followed with air strikes overnight. One of the latest incidents now involves an American teenager badly beaten in a clash with Israeli police. So, how did all this happen? ABC's Alex Marquardt tracks down that American high school student. Reporter: Wave after wave -- a barrage of rockets fired by Palestinian militants all day into Israel. Isreal striking back. And today, calling up some 1,500 reserve troops, preparing for the worst. This, on the heels of the most violent riots Jerusalem has seen in a decade, triggered by the murder of 16-year-old Muhammad Abu khdeir, burned alive by Israeli extremists in what's believed to be a revehicle attack for the killing of three Israeli teens. Muhammad's 15-year-old American cousin, Tariq, was at those clashes when he was viciously assaulted by Israeli police, held down by one officer as the other repeatedly kicked and punched his head. We visited Tariq today -- black eyes, stitches on his lip, deep marks left by plastic handcuffs. They punched me the first couple of times, I was awake until they punched me a little bit more and then I went unconscious. Reporter: Have you watched the video? Yeah. It was really messed up. Reporter: Tariq was here on summer vacation visiting his Palestinian family. He was born in Baltimore. He now lives in Tampa, where he loves fishing with friends. His instagram profile, scenes of a typical American teenage life. But here, police say Tariq joined in the violent clashes and attacked them. Which he denies. Are you angry? Yeah. I'm very angry. I don't know why they gave me a punishment for something I didn't do. Reporter: The state department says they're profoundly troubled by the incident and have called for a speedy investigation. Alex Marquardt, ABC news, Jerusalem.
This transcript has been automatically generated and may not be 100% accurate.